[AudioI] AudioInjector and Guitar

Sun Feb 20 23:28:55 UTC 2022

Similarly, I can mention https://www.muzique.com/ which is a pretty broad and perhaps a bit cluttered assortment of the electronic side of electronic musical instruments (broadly defined). It is but one of a number of sites like it which vacillate between home-builders and buyers. Many are pretty old (both the site and the author). This analog stuff enjoyed a real lift-off (if that is the proper term) starting in the late 1960s with a heyday in the 1970s. j

On Sun, 20 Feb 2022 4:19 PM, hugh crawford wrote:
> Forgot to mention this
> https://www.guitarfetish.com/Neovin-Active-PreampEQ_c_147.html <https://www.guitarfetish.com/Neovin-Active-PreampEQ_c_147.html>
> 
> 
> The guitarfetish site is sort of an uninformative mess, but Googling the products will turn up their old more descriptive web pages.
> 
> On Sun, Feb 20, 2022 at 2:59 PM Joseph DiVerdi <diverdi at xtrsystems.com <mailto:diverdi at xtrsystems.com>> wrote:
> 
>     I have some of this kind of work on my website. Here is an example of an amplifier (and much more) I installed in a bass guitar including (relevant to this discussion) a pickup amplifier and final low impedance output buffer which is capable of driving looong cable lengths with high fidelity. The guitar details can be found at <http://xtrsystems.com/music/20201222%20bass%20guitar/20201222%20bass%20guitar.pdf <http://xtrsystems.com/music/20201222%20bass%20guitar/20201222%20bass%20guitar.pdf>> Other relevant items (including my planned installation of a Ultra audio-injector (another of Matt's fine products) and a raspberry-pi into a big amplifier and speaker system. One possibility for this is a Sonic-Pi application for synthesizer. Another is for looping. Big goals, limited time to work on them.
> 
>     The guitar electronics were intentionally designed to operate on a single (9V) battery knowing full well there would be some power on/off transients (clicks). This was a prototype project (perhaps "throw away"). Two batteries would help or a negative rail DC generator. One of the helpful aspects is that the line voltage output is so high that I had to construct an in-line 10x attenuator that sits at the amplifier input (helping control line impedance and minimizing frequency roll-off, reducing line noise and the on/off transients).
> 
>     I'm happy to discuss electronic circuit design in this context or others. I have been doing this stuff for many years and enjoy sharing the experiences.
> 
>     Joseph
> 
>     On Sun, 20 Feb 2022 3:42 PM, Matt Flax via People wrote:
>      > *** Caution: EXTERNAL Sender ***
>      >
>      > Do you know any circuits online of guitar preamps which are known good ?
>      >
>      > One idea is to design one up - possibly using the Pro soundcard first - because of its available power rails and low noise design and the AIABS inteface which would make it reusable.
>      >
>      > We could work through the design of a preamp there seems to be some interest.
>      >
>      > Matt
>      >
>      > On 21/2/22 09:37, hugh crawford wrote:
>      >> I was really excited to see this because I thought maybe somebody had figured it out. Imagine my disappointment to see that it was pointing back to me. I have not actually figured this out. I am dealing with six extremely low power output single coil pickups and the noise is six times worse than one would get from a regular setup so it’s sort of worst case scenario here.
>      >>
>      >> I am also building the actual guitar so I have been occupied with a multitude of other problems.
>      >>
>      >> Some ideas that I am considering but have not yet tried are to run the guitar signal through some sort of effects box, a booster for instance, that will do impedance matching and deliver a more useful signal to the audioinjector.
>      >>
>      >> In my case I’m thinking of trying six cheapish noise gates since hardly ever am I playing all six strings at once.
>      >>
>      >> Another idea involves using a high impedance Phono preamp as a buffer.
>      >>
>      >> My advice would be to build your device, then if necessary visit your friendly guitar store and try out different stomp boxes as buffers. That’s what I plan to do soon now that they are open to in person business.
>      >>
>      >> On Sun, Feb 20, 2022 at 1:46 PM Matt Flax via People <people at lists.audioinjector.net <mailto:people at lists.audioinjector.net>> wrote:
>      >>
>      >>     Hi Harold,
>      >>
>      >>
>      >>     Some people in the past have build guitar rigs, there is most likely good information here :
>      >>
>      >> https://lists.audioinjector.net/pipermail/people/2020-December/000157.html <https://lists.audioinjector.net/pipermail/people/2020-December/000157.html>
>      >>
>      >> http://forum.audioinjector.net/viewtopic.php@t=5797.html <http://forum.audioinjector.net/viewtopic.php@t=5797.html>
>      >>
>      >>
>      >>     You can also contact those people directly if you don't get a response here.
>      >>
>      >>
>      >>
>      >>     Matt
>      >>
>      >>
>      >>     On 20/2/22 07:02, Harold Désert-Legendre via People wrote:
>      >>>     Hello Audioinjector Users,
>      >>>
>      >>>     I bought the audioinjector soundcard (stereo in/out via rca connectors) in order to build a guitar looper pedal. Will I need to adjust the guitar signal in term of gain? Or Can I directly plug the guitar  into the soundcard (just physically transforming jack into rca).
>      >>>
>      >>>     If anyone has experience with it, thanks for sharing your feedbacks!
>      >>>
>      >>>     Regards,
>      >>>
>      >>>     Harold
>      >>>
>      >>     --
>      >>     Checkout the community email list :
>      >> https://lists.audioinjector.net/mailman/listinfo/people <https://lists.audioinjector.net/mailman/listinfo/people>
>      >>
>      >>
>      >>     --
>      >>     People mailing list
>      >> People at lists.audioinjector.net <mailto:People at lists.audioinjector.net>
>      >> https://lists.audioinjector.net/mailman/listinfo/people <https://lists.audioinjector.net/mailman/listinfo/people>
>      >>
>      > --
>      > Checkout the community email list :
>      > https://lists.audioinjector.net/mailman/listinfo/people <https://lists.audioinjector.net/mailman/listinfo/people>
>      >
>      >
>      >
> 
>     -- 
>     Joseph A. DiVerdi, PhD, MBA
>     XTR Systems, LLC
>     ChemIntelligence for Hemp & Cannabis
>     +1.970.980.5868 - www.xtrsystems.com/ <http://www.xtrsystems.com/>
>     us02web.zoom.us/j/9460709393 <http://us02web.zoom.us/j/9460709393>
> 

-- 
Joseph A. DiVerdi, PhD, MBA
XTR Systems, LLC
ChemIntelligence for Hemp & Cannabis
+1.970.980.5868 - www.xtrsystems.com/
us02web.zoom.us/j/9460709393